Continuous kiln.



W. A. BUTLER. CONTINUOUS KILN. APPLIUATION FILED MAY a. 190s.

96 9,034. Y Patented Aug. 30, 1910.

WITNESSES VENTOR B /1 A RNEY UNITED STATES PATENT OFFICE.

WILLIAM A. BUTLER, OF SAN FRANCISCO, CALIFORNIA.

CONTINUOUS KILN.

To all whom it may concern:

Be it known that I, IILLIAM A. BUTLER, citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvements in ContinuousKilns, of which the following is a specication.

My invention relates to improvements in continuous kilns for burningbricks and other wares.

My present invention is an improvement upon a patent issued to me June5th, 1906.

It consistsin a means for preparing and supplying fuel and controllingsaid supply, and in details of construction which will be more fullyexplained by reference to the accompanying drawings, in which- Figure lis a horizontal section of the kiln. Fig. 2 is a vertical cross sect-ionof same. Fig. 3 shows the controlling mechanism for the fuel supply.

In my former patent I have shown means for supplying the fuel forburning the wares within the chambers, through inclined passages at thebottom, with delecting devices for discharging the heat upwardly intothe burning chambers, and suitable passages and dampers in connectiontherewith.

My present invention is designed to provide a better control of the fuelsupply, and of the heat introduced into the burning chambers so that amore regular burning of the wares may be effected without the danger ofvitrifying or destroying them by a high and uncontrolled heat.

A is the chamber of a kiln, the walls of which may be made continuoushaving any suitable or desired length with relation to the width, andthe ends of any suitable form to connect the sides so that a series ofburning chambers may be disposed continuously around the kiln.

In a kiln of considerable length, the sides may be approximatelyparallel, and the ends semi-circular to effect the above result. Theusual destructible partitions are employed to separate the chambers. Theburning chambers of such a kiln are filled successively with the waresto be burned, and the hres are started in such a manner as to heat upthe chambers gradually and successively, the heat being shut off afterthe contents of the chambers have been suiiicientlv burned,

Specification of Letters Patent.

Application led May 8, 1908.

the fuel.

Patented Aug. 30, 1910.

serial No. 431,526.

and when they are cool enough, the contents may be removed. Thus one ortwo, or more, of said chambers may be under the condition of discharge;others that have already been discharged are being filled, andintermediate ones are in various stages of burning.

I have found that for properly controlling the heat within the furnace,and for the economical use of fuel the following apparatus is verysuitable:

2 is the fuel chamber of the furnace which is located contiguous to theburning chamber A and sufficiently below so that the heat may bedirected therefrom into the burning chamber, as shown in my formerpatent. Above this combustion chamber is a high arch 3, which continuesthe chamber upward to near the top of the kiln. From the top of thisarch a passage l'extends upwardly tothe top of the kiln, and within theupper part of this passage may be any suitable mechanism for controllingthe passage of Such a device is shown at 5, and fuel may be suppliedthrough a spout or funnel as at 6.

In the present device I have shown the apparatus as intended for usingpulverized coal or like fuel, which is introduced through the funnel 6,and is discharged downwardly through the passage 4L in a substantiallyvertical line into the arch 3.

The feed tube 4 is preferably of parallelogram form in horizontalsection, and may be proportionately about 2 feet in length by 4 inchesin diameter. The pulverized fuel entering the upper part of the arch,and falling therethrough to the bottom, is spread and distributed in avery line shower, and meeting the air which is supplied through thetransverse damper controlled passages 7 which open inwardly from outsidethe kiln walls, also from the longitudinal passages between and from thepre-heated re-oXygenated air from the chambers from the already burnedbricks and discontinued chambers, this fuel will be rapidly and evenlyignited, and the heat and gases therefrom will be diverted into the fuelchambers A through the connecting and distributing passages between thefuel chamber and kiln. These fuel supply devices and burning chambersare located at intervals around the kiln, and

the supply of fuel may be very minutely regulated to produce therequired heat, and the falling of the fine fuel through the space fromthe top of the arch, allows it to become ignited during its fall so thata very perfectcombustion is effected.

I'Vhere the fuel is discharged inwardly from the sides with a blast ofair, it takes too large a quantity, and the supply cannot be so welladjusted, and as a consequence too much heat is produced at the point ofintroduction.

I have found that in my present apparatus from two hundred to twohundred and fifty pounds only of the pulverized fuel is necessary for athousand bricks, while if blown or discharged in upon the side, a muchlarger quantity is required. In my present method I have found that I amable to much more perfectly control the heat which increases with thedistribution of the burning gases from the point of ignition.

The passages 7 coincide in position with the main openings through theside of the kiln, through which the wares are introduced or removed;these main openings being bricked up after the chambers are filled. Theopenings and doors or dampers, as at 7, control the admission of air tothe passages 7. These passages are open at a point some distance behindthe actual burning chamber. There may be as many as four or moreintervening chambers which have been completed and are still hot. Theair then admitted through the opening in the passages 7 passes directlyinto the interior of the kiln, thence along there-through to the chamberor chambers in which the burning is being carried on.

The usual destructible partitions are burned or broken so as to allowthe air to pass, and it is gradually heated up by the heat of thealready burned wares, so that it is delivered to the burning chamber ata high temperature. Passages 8 connect the openings 7 through the wallsof the kiln, and these passages serve to supply an additional amount ofair, if needed. Subterranean passages 9 connect with each chamber of thekiln, and these passages connect through gates or dampers 10, with thepassage 11, which leads to the discharge flue or chimney. By openingeither of the dampers 10, it will be seen that the draft through thepassages 7 and 8, and the subterranean flue 9 of the chambers, throughwhich the draft is desired, will be established.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. A continuons kiln consisting of outer and innerwalls with an intermediate chamber for the reception of wares to beburned, said walls being recessed at regular intervals to form fuelchambers, contiguous to the inner chamber and below the kiln floorlevel, said fuel chambers being offset from the sides of the burnerchambers and opening thereinto and being of substantial height to allowthe fuel to separate and be ignited as it falls, and passages openinginto the tops of said fuel chambers to admit fuel by gravitation.

2. A continuous kiln consisting of outer and inner walls with anintermediate chamber for the reception of wares to be burned, said wallsbeing recessed at regular intervals to form fuel chambers, andsuperposed arches opening into the burning chamber, said fuel chambersbeing of substantial height to allow the fuel to separate and be ignitedas it falls to the bottom thereof, and having controlled vertical fuelfeed openings into the crowns of the arches.

8. A continuous kiln consisting of outer and inner walls inclosing anintermediate burning chamber in which the wares to be burned are stackedwith intermediate destructible transverse partitions, said walls havingrecessed arches and combustion chambers opening into the burningchambers, said combustion chambers being of substantial height to allowthe fuel to separate and be ignited as it falls to the bottom thereof,gravity feed openings through the crowns of the arches, and transversegatecontrolled passages thro-ugh the outer walls communicating with thecombustion chambers.

a. A continuous kiln consisting of outer and inner walls inclosing anintermediate burning chamber in which the wares to be burned arestacked, with intermediate destructible transverse partitions, saidwalls having recessed arches and combustion chambers opening into theburning chambers, gravity feed openings through the crowns of thearches, transverse gate-controlled passages through the outer wallscommunicating with the combustion chambers, and passages parallel to thewalls connecting said transverse passages.

5. A continuous kiln having interspaced outer and inner walls, withrecessed arches in their inner faces, and combustion chambers at thebottom of said recesses and below the kiln floor level, gate-controlledinclined passages leading transversely through the walls, the inner endsconnecting with the combustion chambers, and passages connecting saidinclined passages to transmit air to burning chambers distant from theinlet.

6. A continuous kiln having interspaced outer and inner walls withrecessed arches in their inner faces, and combustion chambers at thebottom of said recesses and below the kiln floor level, gate-controlledinclined passages leading transversely through the walls, the inner endsconnecting with the combustion chambers, passages connectmy hand inpresence of two subscribing ing said inclined passages to transmit airto Witnesses. burning chambers distant from the inlet, a subterraneanCentral flue leading to a chimney, and similar flues connecting the kilnWitnesses: floor and chambers with said central flue. B. B. LEE,

In testimony whereof I have hereunto set J. B. LORGOMER.

lWILLIAM A. BUTLER.

